object.Filter = [ value ]
SELECT <geometry columns>,<symbology column>,<label column> FROM <featuretable> WHERE <filter clause> AND <extent check clause>
Applying an effective Filter to an AXF layer can reduce the number of features that ArcPad needs to draw from the layer. As a result a Filter can improve the drawing performance of AXF layers.
Columns in the AXF feature table are specified using brackets (for example, [MAXSCALE] is used to specify the MAXSCALE column). ArcPad provides a built-in variable, @##MAPSCALE##, that allows the current map scale to be included in the Filter. Each time the SELECT statement is executed, the current map scale is substituted in to the filter wherever @##MAPSCALE## has been used.
Here's an example Filter: @##MAPSCALE## < [MAPSCALE]